Lamp-socket.



S. TROOD;

LAMP SOCKET. 'APPLIbATION FILED MAR. s, 1912.

- Patented Feb. 25, 1913. 1 .z 7

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SIhBFiUEL TRQOB, 6E NEX -I YORK, N. Y., ASSIGNOR, BY MESNE ASSIGNMENTS, TO PLUG CGNI'IEG'EEKQN ELECTRIC COMPANY, A SORPQRAIION OF NEW YORK.

LAMP-SOCKET.

i oneness.

Specification of Letters Patent.

Patented Feb. 25, 1913.

Application filed March 5, 1912. Serial No. 681,848.

Loom-Sockets, of which the following is a specification.

The common form or electric sockets. used in connecting the wires of an electric circuit to a translating device, such as an electric lamp, or to an attachment plug or other electric connector, consists oi 'a suit-- able insulating socket and a threaded shell therein, forming one terminal of the circuit, and a centrally located contact point, secured to the socket and forming the other terminal of the circuit.

The present invention refers to an electric fitting which is unipolar, 2'. 0. having means for connecting with one. terminal only, oi. an electric circuit, while the means for connecting with the other terminal of the circuit, are supplied by a separate element, entirely independent of the fitting itself.

It is one of the objects of the present invention to provide unipolar electric fitting which is of extreme simplicity of construction and of great durability""and can be manufactured at a fraction of'the cost, at which similar sockets were made heretofore.

The invention comprises, in substance, an insulating socket, havingsan interior shell secured thereto which provided with means, on the one hand, to make contact with one terminal of a leading-in circuit and, on the other hand, with one contact.

- of a translating device, such as an electric incandescent lamp, or one terminal of an electric connect-or, such as an attachment plug or other device. in the employment or" this unipolar socket, the leading-in wires are secured to a separate and independent] terminal plu havinga cent-rally located terminal contact and a peripherally located contact ring. This terminal plug is inserted into one end of the socket and mechani cally held thereon by any suitable device,

such as a cotter pin, a bayonet lock, screw connection or other means, so that the contactring of the plug makes contact with the inner shell of the socket, while the center terminal point of the plug, ailords the second contact, necessary in continuing a the 'tion Of,lil18 inner shell of the socket.

electric circuit to the translating'of the connecting device, held in the socket.

The accompanying drawing illustrates the invention, as applied to a lamp socket,

and Figure 1, shows an elevation of the inrention and in part in longitudinal cross section, and Fig. 2, a horizontal cross section-1n the line AB,'ot Fig. 1'.

l The insulating socket is represented at 1.

and is provided with an outer shell 2, preferably of metal, having an'upper portion 3, locked or otherwise secured to the lower portion, and. provided with a tubular neck 4. The conducting member of the socket is shown as an inner shell, having a cylindrical threaded portion 5, for r'eceivin the shell terminal of the base of an electric in candescent lamp or of an attachment plug, and an upper-preferably conic portion 6,

for making contact with the contact ring.

of the terminal plug of the leading-in oil-\- cuit. This inner shell may ,be secured to the insulating body by atongue 7 locking in a suitable recess, or any other means provided for this similar purpose. The conic portion 6, of the inner shell -is provided with slits 8, thereby: forming a number of resilient' tongues, for yieldingly makin contact with the contact ring. descent lamp 9, or other translating or connecting device is screwed into the shell in the usual way. The terminal plug of the leading-in circuit consists of a tribe l0, hav ing at its end an insulating portion 11, conveniently secured thereto and provided with a peripherally contact ring 12,215; one terminal or the'leadingin circuit, and a, preferably resilient, centralcontact 13, as the other terminal or. the circuit. contact 14, of the electric lamp or the attachment plug, makes contact with the center contact 13, of the terminal plug, while the threaded portion 15, of the lamp base,-

makes Contact; with the corresponding por- The leading-in wires of the terminal plug, are

. shown. at 16 and 17. A cotter pin 18, pene-- trating the neck 14, of the outer shell of the socket and'also the tube 10,'of the ter: minal plug, provides the mechanical connection between the plug and the socket.

It. will be, seen that this unipolar electric.

fitting is eminently adapted for connecting a main circuit. to derived circuits, eliminatmg thereby. all soldered or other. connec- The center An electric incantions that heretofore had to be employed in devices of thisgeneral character, and thefitting is so simple of construction that even unskilled labor may be employed in using it in all kinds of electrical wiring and systems of electrical distribution.

What I claim and desire to secure by Letters Patent of the United States, is-

1. The combination in a unipolar socket, with an insulating member, of a conducting member therein, comprising a rigid cylindrical portion and a resilientportion.

2. The combination in a unipolar socket, with an insulating member, of a conducting member therein, comprising arigid cylindrical portion being threaded and a resilient portion.

The combination in a unipolar socket, with an insulating member, of a conducting member therein, comprisingv a rigid cylindrical portion and a resilient conic portion. 4:. The combination in a unipolar socket, with an insulating member, ofa conducting member therein, comprising arigid cylindrical portion being threadedand a resilient conic portion.

5. The combination in a unipolar socket, with an insulating member, of a conducting member therein, comprising a rigid cylindrical ortion and a resilient conic portion, and a detachable member, having a peripheral terminal adapted to contact with said resilient portion and a second terminal atfording a center contact. v 6. The combination in a unipolar socket, With an insulating member, of a conducting member therein, comprising'a rigid cylindrical port-ion and a resilient conic portion, a detachable member, having a peripheral terminal adapted to contact with said resili- 40 cut portion and a second terminal aflording a center contact, and means for securing said detachable member to said socket.

Inwitness whereof I have hereunto set my hand in the presence of two subscribing witnesses, at New York, in the county of New York and State of New York, this 29th day of February 1912. I SAMUEL TROOD. In presence of; W. EUGENE BLAUVELT, RALPH J. SACHERS. 

